Study on impact fusion at particle interfaces and its effect on coating microstructure in cold spraying |
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Authors: | Wen-Ya Li Chao Zhang Xueping Guo Hanlin Liao |
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Affiliation: | a LERMPS, Université de Technologie de Belfort-Montbéliard, site de Sévenans, 90010 Belfort cedex, France b State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China |
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Abstract: | This paper deals with the impact melting phenomenon at the interfaces between the deposited particles in cold-sprayed coatings and its effect on coating microstructure and particle bonding mechanism. Al-12Si, Al2319, Ti, Ti-6Al-4V, Ni and NiCoCrAlTaY powders were selected as feedstocks, which have various thermal and mechanical properties. The analytical results showed that most of the used materials possibly experienced the local melting at the contact interfaces of particles under certain impact conditions. Low melting point, relatively high gas temperature and chemical reaction with the atmosphere are the main factors contributing to the impact fusion during cold spraying. The results also indicated that the local melting would benefit the formation of a metallurgical bonding between the deposited particles and enhance the coating cohesion. |
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Keywords: | Cold spraying Particles Aluminium alloy Titanium alloy Nickel alloy Impact fusion |
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